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Volvo 850 Accessories Manual

Manual is about: 1996

Summary of 850

  • Page 1

    Cruise control system 1995 volvo 850 1995-96 accessories & equipment volvo cruise control systems 850 note: 1996 850 models are equipped with obd ii diagnostic connector located in center console. Follow instructions included with volvo scan tool (998-8686-3) for diagnosis and testing. Description &...

  • Page 2

    Fig. 2: locating brake & clutch valves & servo courtesy of volvo cars of north america. Control unit control unit is located in underhood fuse and relay center. See fig. 3. Control unit receives signals from sensor and switches. Main function of control unit is to decide if system can be controlled ...

  • Page 3

    Diagnostic hookup. Fig. 3: locating control unit & terminal identification courtesy of volvo cars of north america. Vacuum pump & regulator.

  • Page 4

    Vacuum pump and regulator are contained in one unit, located in left front corner of engine compartment. When cruise control system is operating, a 12-volt electric motor pumps vacuum when accelerator is depressed, sucking air out of tube which leads to vacuum servo. Air is pumped out through right ...

  • Page 5

    Fig. 4: locating diagnostic unit courtesy of volvo cars of north america. Connecting diagnostic system remove covers on diagnostic units. Connect selector cable to socket no. 2 on diagnostic unit "b". See fig. 4. Transfer rate test mode 1) in this test mode, transfer rate (speed of information).

  • Page 6

    Between control unit and diagnostic hookup can be changed. This is useful if system is read with a display instrument (scan tool). See transfer rate test codes table. This step is not necessary if normal rate is desired, as this rate is loaded with each ignition start. 2) to enter transfer rate test...

  • Page 7

    2-2-3 ......................... Shift a/t from "n" to "d" with selector in off position 1-3-2 ............................... Depress brake pedal 3-1-1 ................................... Several signals selector switch test (response code 1-1-3) 1) response code 1-1-3 is obtained when selector is s...

  • Page 8

    Battery voltage is present, go to next step. If battery voltage is not present, replace selector switch. 2) remove cruise control unit from under-hood fuse and relay center. See fig. 3. Connect voltmeter between ground and cruise control unit base terminal 8t. Turn ignition on. Set cruise control se...

  • Page 9

    Vacuum system check note: to properly test vacuum system, it is necessary to operate vacuum motor and regulator with jumper wires from control unit base. Use care when connecting wires as an incorrect connection can destroy components. Jumper wire manufacture 2 jumper wires. One should be a single w...

  • Page 10

    3) let vacuum servo remain contracted for at least 30 seconds to ensure there is no leakage in vacuum system. See fig. 2. To release vacuum servo, remove wire from terminal 9s. Turn ignition off. If system operates as described, go to step 7). If system does not operate as described, go to next step...

  • Page 11

    Or an abnormal speed signal. Code is stored only if control unit has had a normal signal at some time during road test and not for stationary interruptions. Code 1-2-2 is stored when ignition is turned on. It remains until vehicle speed is greater than 22 mph for at least 15 seconds. If code remains...

  • Page 12

    1-1-1 (one press each time led lights). Hold activation button down about one second each time. Read response code. Code 1-1-4 (safety disengagement) code 1-1-4 is set in event of a safety disengagement. Safety disengagement does not necessarily mean something is wrong with system. Cruise control sy...

  • Page 13

    Brakelight switch removal & installation remove brakelight fuse. Remove brakelight switch connector. Remove brakelight switch. To install, reverse removal procedure. Wiring diagram fig. 6: cruise control system wiring diagram (1995-96).